Safety helmet



FIG. 1 is a front, left-side perspective view of the safety helmet;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left-side elevational view thereof, which is a mirror image of the right-side elevational view thereof,

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a safety helmet, as shown and described. 